Final answer:
A UCP can perform a controlled act if someone with the authority delegates it to them.
Step-by-step explanation:
In this question, the subject is Law. The question is asking about the authority of a UCP (uncertified practitioner) to perform a controlled act. According to the given information, a UCP can only perform a controlled act if an individual who has the authority to do so delegates this authority to the UCP. In other words, the UCP can only perform the act through an exception or when given explicit permission by someone with the authority.